For example, you may be working on a story about a company or subject and have information in emails, your Dropbox account, Google Calendar and LinkedIn. One search in Greplin will allow you to surface the source documents and references to the company or topic.

The basic subscription is free and includes those accounts listed above. You can unlock services such as Delicious by tweeting about Greplin, and there are some services, such as Evernote, only available with Greplin Premium.

There is a free iPhone app and also a browser extension for Chrome, which is well worth adding. This enables you to search your files simply by prefixing your query with a “g”.